Question

Assertion: Melting points of isomeric dihalobenzenes are nearly the same.
Reason: Isomeric dihalobenzenes have different molecular masses.
A. If both assertion and reason are true and reason Is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assetion is true but reason is false.
D. If both assertion and reason are false.

Answer 1

Correct Answer - D
The para-isomers are high melting as compared to their ortho-and meta-isomers. This is due to symmetry of para -isomers that fit in crystal lattice better as compared to ortho-and meta-isomers.